Ignition timer brush



Oct. 12,1926. 1,602,646

M. BuRRusS v IGNITION TIMER BRUSH Filed Oct. 20 1925 1111 1652 Jamaal/5.

1.\'I 'ENTOR.

ATTORNEY.

Patented Oct. 12, 1926.

UNITED STATES MILLER BURRUSS, OF OVER'BROGK, KANSAS.

IGNITION TIMER BRUSH.

Application filed October 20, 1925.

My invention relates to that type of an ignition timing system commonly used by the Ford automobile.

The object of my invention is to provide an inexpensive brush contacting means.

A further object of my invention is to provide a supporting means for the brush spring for convenience of assembly and a protection to the spring when driven backward by a back fire in the engine.

A still further objectof my invention is to provide a brush member having an angle so that the wearing away of the brush will not vary the contact point.

A still further object is to provide a 'resilient reenforcing means for the spring.

These and other objects will hereinafter be more fully explained.

Referring to the drawings:

Fig. I is an inside view of the case, the post on the adjacent member being in section.

Fig. II is a part sectional view on the diametrical axis of the case, parts broken away for convenience of illustration.

Fig. III is an enlarged detail view of the brush and a fragmentary portion of the case.

Fig. IV is a sectional view through the springs and supporting member on line AA in Fig. III.

In Fig. II, 1 is a fragmentary portion of the crank case, 2 is a cam shaft on which is mounted an arcuated support 3, the end of which is bent to an annular form as at A fitting on the end of the cam shaft and securely fastened thereto by means of a pin 4: the said pin being held to engagement by means of a washer 5, said washer having a flange extending downward to engage over the end of the pin as shown in Fig. II; the

, said washer being fastened by a nut 6 which is threaded on the end of the cam shaft. The brush, when positioned on the end of the shaft is ready to receive the casing 7, which is tensioned in position by a spring 7 pivotally bearing on the casing at 7", and the said casing engagingin an annular-flange B integral with the crank case 1, the said casing being rotatably mounted in said flange is actuated by a rod connected to the clip 9, (said rod not being shown) the object of which is to advance or retard the spark. In casing 7 is positioned an insulation annular member 10, quadrantly positioned therein are contact plates 11, the said plates being held in position by binding posts 12 which Serial No. 63,694.

are adapted to connect with the wiring system.

My invention does r lie in the casing or parts connected therevith or its means of rotation but in bru h mechanism as follows: Connecting to the arcuated support is a spring 13 having a reinforcing member 14, and the said members having perforations in registry adapted to receive a bolt 15, by which means the support and spring are bound firmly together at one end. and as the said spring engages on the inner periphery of said member found it necessary to provide laterally extending members 1.6 and 1.6 on both edges thereof and integral therewith as means for keeping the spring in alignment with the support, and to proper engagement with the annular member 10. On the freeend of the spring I have positioned a brush 17 which makes and breaks the circuit for ignition in its rotations, traveling in the direction of the arrow. The said brush being subject to wear as it frictions firmly in its rotations on the inside periphery of the annular member 10, in time the said brush. will wear away until the spring is reached and to maintain the same timing contact, I have cut the end of the brush at a segmental angle as at C, the radius of which is centered as at I), this being the continuous bearing point, therefore it is readily seen how the tangent of the segment will engage with the end of plate 11 at the same instant until the brush is worn through; the amount of time corrected by the angle is equal to the distance between the axis line E and the end of plate 11 as shown in Fig. III indicated by F.

The former type of brush that is commonly used in this style of case was a roller which failed to clean the su face of theannular member or remove sediment from the face of the roller, and such obstruction often broke the current; but my newly invented brush tends to scavenge the contacting surface of both.

In Fig. III is shown the direction of rotation by an arrow G, and should the engine backfire causing the rotation to reverse, the support 3 in such case will function as a protection preventing the spring from doubling. causing it to break or bend out of position, and the said support 3 is supporting means for holding the brush in close position to the cam shaft rendering it much easier to place the case than if the spring was released allowing it to extend outward as would be the case if it were not confined by the arcuated support.

Raving thus described my invention, What I claim as new and desire to secure by Letters Patent is In an ignition timer brush, in combination with a cam shaft and a timer casing", an arcnated supportin member, said member being rigidly attaelvd to the cam shalt, laterall extending arms on said member as guiding and retaining means, a spring and an auxiliary spring attached to said support, said springs engaging between said lateral extending members of said support, a brush attached to the outwardly extending end of first said spring, the forward end of the brush having a curved shape with radii of curvature centered near the end of the supporting member so that the curved shape of tne brush swinging tangentially will contact at the same instant as the brush wears away.

MILLER BUR-RUSS. 

